Green Roof: Advantages, Disadvantages, and Vegetation Types

This article provides an overview of green roofs, including their advantages and disadvantages. It discusses the types of vegetation used in green roofs and their impact on energy efficiency. The article also explores the benefits of green roofs in reducing energy costs and absorbing stormwater.

Green Roof
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Contents
INTRODUCTION...........................................................................................................................3
MAIN BODY..................................................................................................................................3
Background Information on Green Roofs...................................................................................3
Type of vegetation used in green Roofs......................................................................................4
Advantage and Disadvantage of Green Roofs.............................................................................5
Energy Benefits of Green Roofs..................................................................................................5
Thermal Properties and Thermal insulation................................................................................7
CONCLUSION................................................................................................................................7
REFERENCES................................................................................................................................8
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INTRODUCTION
A green roof is a based on the building that are partially as well as completely covered with
vegetation and also growing planted over water proofing membrane. It may include different
additional layers such as drainage, root barrier and irrigation system. The documentation will
describe about the Green roofs which last longer than convention for reducing energy cost
through natural insulation. It will create peaceful retreats for animals and people which are
automatically absorb storm water. The essay will cover the advantage and disadvantage of Green
Roofs. It will discuss about the different type of vegetation that mainly used in Green Roofs.
MAIN BODY
Define Green Roofs
A Green roof system is a type of extension that existing roof which mainly involves high
quality of water proofing, drainage system, root repellent system and other type of light-weight
growing medium and plants. It can be defined that Green roof may be design in modular, filter
and also growing media. This type of Green roof development include creation of contained
green space through human-made structure (Baciu, Lupu and Maxineasa, 2019). On the other
hand, A green roof is simply assuming the growth of vegetation because it is made of
waterproofing layer so as growing plants. Green roofs can be divided into different groups:
intensive, semi-intensive and extensive.
Extensive roofs have growing medium shallow which usually less than six inches with
limited plant diversity. Sometimes, it is not accessible. Intensive green roofs have grown deeper
soil medium which always support for diversifying in selection of plant. It may include small
trees. These are three different type of green roofs which require for specific layers in roofing
materials (Mahmoodzadeh, Mukhopadhyaya and Valeo, 2020). It consists of drainage layer,
roofing membrane, Thermal insulation. Filter membrane and structural roof support. These
layers have performed different task to keep maintain and protect structure layer.
Background Information on Green Roofs.
The origin of Green Roofs began thousands of years ago, consider the most famous green
roofs that are hanging Garden of Babylon. It is to be considered in seven wonders of ancient
world and also constructed around 500 B.C. The extensive green roofs are basically lightweight
adaptation of sod roofs which help for reconstructing the overall design structure. It is the most
extensive Green roof that beneficial for resolving urban environmental problems and issues. In
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2005, it is estimating 13 million m Square roof area in different areas. It would be covered the
large amount of plants. Many cities in other parts of entire world. it can be adopted the
lightweight technology that has been growing in wide areas. In past decade, it has organised
annual green roof conference so that different cities have adopted program or policies which
promote extensive Green roofs. This type of technology began in seventies when they were
marketed and developed on large scale (Ebadati and Ehyaei, 2020). It must offer reliable
technology for providing sophisticated irrigation and also protect against root ingress.
Green roofs directly effects on the Global warming when they are naturally absorbing
carbon dioxide and leading greenhouse gas behind the global warming. However, it will be
measured that potentially impact of green roofs on level of carbon dioxide. Furthermore, Green
roofs automatically recover the green space in urban places and provide benefits to wildlife,
public and farmers (Gomes, M Silva and Silva, 2019). It also reduced the storm water runoff
which mitigate heat in the island and easily absorb smog, dust and reduce CO2 level within
atmosphere. In another way, Adversely Green roofs affects the overall atmosphere condition and
situation while controlling design or system management (Gomes, M Silva and Silva, 2019).
Green roofs are considered the sustainable and become different from conventional roofs. It is
basically used on the natural plant life to cover roof in the place of other type of roofing raw
materials. It has proven to help for reducing heat, performed significant role for mitigating heat
island effects. Green roofs provide shade and remove heat from air while reducing temperature
of roof surface in surroundings. In additional, Green roofs can be reduced the building energy by
0.8% and compared with conventional roofs.
Type of vegetation used in green Roofs.
Currently, there are different kind of system build the green roofs but it become extensive
which are quietly convenient. It also composed with thin and low-lying layer in term of rain
water absorption (Mahmoodzadeh, Mukhopadhyaya and Valeo, 2020). It is also performed the
fundamental function such as water filtering, cleaning air quality. Sometimes, it requires to
minimum maintenance because roofs are lighter than other types of green roofs.
Sedum spurium: It is a type of perfect ground cover which covered beautiful colours
depending on their cultivar. The vegetation is mainly growing in different soil type and also
tolerate a few hours of shadow day.
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Grasses: It is based on the tricky but many species that have what it takes to be used in the
different condition of Green roof (Kotsiris and et.al., 2019). It is covered the large areas and also
combined with succulents. This type of vegetation cam easily refills roof garden and their roots.
Sedums and another type of succulent plants are often used on Green reefs. It can easy to
control and tolerate dry condition. in most common sedum species could survive and also
maintain their photosynthetic metabolism.
Advantage and Disadvantage of Green Roofs.
Advantage
Green Roof is extremely efficient at regulating overall temperature and also absorb heat on hot
day. It allows for valuable heat which easily escape on cold days. In addition, it is helping for
regulating temperature in construction building (La Gennusa and et.al., 2019).
Nowadays, it has been increased the lack of vegetation which increasing carbon-dioxide. At
that time, Green roof uses for making unused plant and easily absorb pollution, emitting oxygen.
Green roofs can be filtered the storm water, usually when thicker soil. It is also known as
intensive system. it helps for reducing overload sewage treatment system and easily purifying the
rainwater.
It will be reduced energy cost by using Green roofs. It become less expensive in both heating
and cooling perspectives.
Disadvantage
Green Roof is more expensive that easily install than traditional flat and underlying the
overall structure.
Green roofs will be heavy so that it has increased structural limitation. It means that Green of
dream can be too heavy for current building structure (Mahmoodzadeh, Mukhopadhyaya and
Valeo, 2020).
It is becoming complex to repair the roof springs leak. Sometimes, it is difficult to fix, locate
and get the roof’s garden.
Energy Benefits of Green Roofs.
A Green roof has many advantage or benefits at different level such as Societal, economic
and ecological level. It provides the rainwater buffer, filtering and purifying air, reduce the
overall ambient temperature (Li, 2019). It automatically regulates indoor temperature which
always inspiring biodiversity in global world. The green roof is part of construction climate
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proof which always helps for people to maintain green environment. Many peoples are happier
in the green environment for maintaining and controlling atmospheric temperature level (Gomes,
M Silva and Silva, 2019). A green roof easily absorbs rain water by using water buffering
through plants, drainage layer. Sometimes, it may delay the discharge of rainwater by suing
sewage system. water may be evaporated by plants. Therefore, it helps for stabilizing the level of
ground water and also reduce load on sewage system. in another way, it can be identified that
plant can directly absorb sunlight so that it easier to develop pleasant environment.
For maintaining indoor climate such as air conditioning which directly turn into save
energy. It has been rapidly positive impact on the climate immediately (Mahmoodzadeh,
Mukhopadhyaya and Valeo, 2020). A green roof reduced the entire temperature on roof and
efficiency of solar panel is higher which reduced total price of energy. In buildings, A green roof
act as sound barrier, absorb sound thus provide silent environment. it applicable in both outside
as well as inside building. It also protects the roofing material from external which influence
rain, sun, temperature and wind. It may double and triple. The sustainable and natural appearance
are combined with the energy reduction price and also extension of life span in Green roof. In
this way, it will increase the value of property. By using vegetation, Green roof is creating as
generate green outcome. it is carefully pre-cultivated on delivered 90% boast coverage
(Mahmoodzadeh, Mukhopadhyaya and Valeo, 2020). It become easier to establish Green roof
for maintaining and controlling environment. sometimes, it has found that green roof exposed to
deals with vegetation blankets and make ensure that it will not blow away in storm. These
provide the solid erosion resistant top layer in Green roof.
StormWater Attenuation
It mainly relates to storage of excessive water during storm. It mainly followed by control
store water. It can be designed the rate of release which is lower than runoff. Sometimes, it is
effectively controlled natural flow. It is an essential for building construction on hard surface on
different area of land (Porcaro and et.al., 2019). In this way, it easily removes natural vegetation
and soakage. It may affect on the flow of stormwater system which increased water level,
velocities in stream causes erosion to environmental damage.
If it is undertaking the building project which will require to consider attenuation and
identify the flow of chart.
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Thermal Properties and Thermal insulation.
Thermal properties of insulating raw material and other type of fishing vessel construction
for purpose of materials. Sometimes, it can be measured in accurately. There are large amounts
of heat transmission flow by using combination of different materials. It is an essential for
understanding certain technical terms (Porcaro and et.al., 2019). It able to measure and calculate
loss of heat and involved the different factors such as Thermal conductivity, heat energy, thermal
resistivity, resistance of water.
On the other hand, Thermal insulation is based on the process for reducing heat transfer between
two objects. It is also insulating against transmission of heat where materials are become low
heat connectivity so as chances of radiation. Main function of thermal insulation is to reduce heat
transmission, holding into walls, pipes (Vijayaraghavan, Reddy and Yun, 2019). Therefore, it
automatically controls large amount of heat leakage and improve efficiency in the insulation
process. The prevention of heat transmission by entering into warm air and engine room. It will
easily optimize the useful capacity and minimise price of operation.
Since, the composition of green roof is based on the term, which are significantly different
in natural soil. It is important to identify and measure thermal property that specified to green
roof soil. Furthermore, Green roof utilise both intensive as well as extensive technology. So as
easily understand that how heat entering and leaving the green roof (Gomes, M Silva and Silva,
2019). It has established the different layers that help for calculating heat flux. It is to be
considered the complex model that specify radiant heat transfer in Green roofs.
This is when heat transfer by using solid materials from high to low temperature areas. In
this way, it is calculating the rate of heat transfer through materials which governed by thermal
connectivity (Vijayaraghavan, Reddy and Yun, 2019). At that time, thermal insulation plays
important role in Green roofs where it slows down heat transfer so as it automatically low
thermal connectivity. The heat may be transferred in the form of liquid or gas. The presence of
water through soil and other drainage layer in the Green roofs. It directly affects on the entire
temperature of Green roof. In this way, it is blowing wind across roofs.
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CONCLUSION
From above discussion, it concluded that Green roofs is view of urban areas that shows
black tar and Gravel-ballasted rooftops. It has summarised about the Green roofs which last
longer than convention for reducing energy cost through natural insulation. It is useful for
creating peaceful retreats for animals and people which are automatically absorb storm water. It
is mainly covered the advantage and disadvantage of Green Roofs. There are different types of
vegetation that can be used in Green Roofs.
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REFERENCES
Book and Journals
Baciu, I.R., Lupu, M.L. and Maxineasa, S.G., 2019. Principles of Green Roofs Design. Buletinul
Institutului Politehnic din lasi. Sectia Constructii, Arhitectura. 65(3). pp.63-75.
Ebadati, M. and Ehyaei, M.A., 2020. Reduction of energy consumption in residential buildings
with green roofs in three different climates of Iran. Advances in Building Energy
Research. 14(1).pp.66-93.
Gomes, M.G., M Silva, C. and Silva, M., 2019. Impact of Vegetation, Substrate, and Irrigation
on the Energy Performance of Green Roofs in a Mediterranean Climate. Water. 11(10).
p.2016.
Kotsiris, G. and et.al., 2019. Carbon footprint of green roof installation on school buildings in
Greek Mediterranean climatic region. International Journal of Sustainable Energy. 38(9).
pp.866-883.
La Gennusa, M. and et.al., 2019. Green Roofs and Envelope Thermal Insulation of Buildings in
European Climate: When Do the Possible Drawbacks Overtake the Positive Effects?.
In BS2019-16th IBPSA International Conference.
Li, R.Y.M., 2019. Green Roof Safety: A Tale of Three Cities. In Construction Safety
Informatics (pp. 91-101). Springer, Singapore.
Mahmoodzadeh, M., Mukhopadhyaya, P. and Valeo, C., 2020. Effects of Extensive Green Roofs
on Energy Performance of School Buildings in Four North American Climates. Water.
12(1). p.6.
Porcaro, M. and et.al., 2019. Long term experimental analysis of thermal performance of
extensive green roofs with different substrates in Mediterranean climate. Energy and
Buildings. 197. pp.18-33.
Vijayaraghavan, K., Reddy, D.H.K. and Yun, Y.S., 2019. Improving the quality of runoff from
green roofs through synergistic biosorption and phytoremediation techniques: a
review. Sustainable Cities and Society. 46. p.101381.
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